Oracle
A service that provides external real-world data to smart contracts on the blockchain. Oracles bridge the gap between on-chain and off-chain data.
Why It Matters
Oracles act as bridges between blockchain networks and real-world data, providing essential information needed for smart contracts to function properly. They expand the capabilities of blockchains, enabling them to interact with the outside world.
Example
For example, a weather oracle can provide weather data to a smart contract that pays out if it rains, enabling decentralized applications to operate based on real-world conditions and events.
Beginner Context
For those new to the crypto space, understanding oracles can open up new possibilities in decentralized applications and finance. They illustrate how blockchains can integrate external information, enhancing their functionality.
Mike Starr
Founder, CryptoWizardTools · M.S. Organizational Management
Last reviewed: August 2026
Related Terms
Initial DEX Offering
A token launch that takes place on a decentralized exchange rather than a centralized platform. IDOs give the public earlier access to new projects and allow for immediate open-market trading once launched.
WAGMI
"We're All Gonna Make It." An optimistic crypto community slogan expressing collective belief in a project or the market. It is the positive counterpart to NGMI and is used to build community morale.
Resistance
A price level at which a cryptocurrency has historically had difficulty breaking above. When an asset approaches a resistance level, selling pressure tends to increase. If the price breaks through resistance, it can signal a strong uptrend.
Custodial Wallet
A wallet where a third party (usually an exchange) holds the private keys on your behalf. Custodial wallets are convenient and allow password recovery, but mean you do not truly control your funds — "not your keys, not your coins."
Total Value Locked
The combined value of all cryptocurrency assets deposited into a DeFi protocol at a given time. TVL is a key indicator of a protocol's size, usage, and popularity. A higher TVL generally signals greater trust and adoption.